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@article{DAN_1973_211_3_a2, author = {I. S. Kats}, title = {Density of the spectrum of a string}, journal = {Doklady Akademii Nauk}, pages = {520--523}, publisher = {mathdoc}, volume = {211}, number = {3}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1973_211_3_a2/} }
I. S. Kats. Density of the spectrum of a string. Doklady Akademii Nauk, Tome 211 (1973) no. 3, pp. 520-523. http://geodesic.mathdoc.fr/item/DAN_1973_211_3_a2/